(feat): added captcha for invalid login

logincontroller.php

@@ -4,21 +4,39 @@ require_once("Models/User.php");
 
 $user = new User();
 $userDataSet = new UserDataSet();
-
 if (isset($_POST["loginButton"])) {
     $username = $_POST["username"];
     $password = hash("sha256", $_POST["password"]);
+    if (isset($view->loginError)) {
+        $generatedCaptcha = $_POST["generatedCaptcha"];
+        $userCaptcha = $_POST["captcha"];
 
+        if ($generatedCaptcha !== $userCaptcha) {
+            $view->loginError = "Incorrect CAPTCHA.";
+            return;
+        }
+    }
     // create a new student dataset object that we can generate data from
+    // Error handling is VERY hacky, because of the lack of JS usage.
     if($userDataSet->checkUserCredentials($username, $password)) {
         $user->Authenticate($username, $password);
-    }
-    else {
-        echo "Error in Uname / Pass";
-    }
+        // Unset modal boolean to hide it's usage.
+        unset($_GET['modal']);
+    } else {
+    // Add error message and redirect to display modal
+    $view->loginError = "Invalid username or password.";
+    // Set modal boolean to header to allow modal to reappear
+    $queryParams = http_build_query(['modal' => 'true']);
+    header("Location: {$_SERVER['PHP_SELF']}?$queryParams");
+    exit;
+}
 }
 
 if (isset($_POST["logoutButton"]))
 {
     $user->logout();
 }
+
+if (isset($_GET['modal']) && $_GET['modal'] === 'true') {
+    $view->loginError = $view->loginError ?? "Please solve the Captcha and try again.";
+}